A parent invests $2000 at a 5% interest rate to help his daughter save for college. How long will it take his money to double?

20 years

Step-by-step explanation:

Principal = $2000

Rate = 5%

Interest = $2000

Time = Unknown

Since we want to know the time it will take his money to double, that means he'll have an interest of $2000.

Interest= PRT/100

2000 = (2000 × 5 × T)/100

2000 = 10000T/100

Cross multiply

2000 × 100 = 10000T

200,000 = 10000T

T = 200,000/10,000

Time = 20 years

898.1666667

step-by-step explanation:

5389/6 = 898.1666667

d. 24+-0.114

step-by-step explanation:

the question requires us to calculate the approximate 95% confidence interval for the mean number of ounces of ketchup per bottle in the sample given the following statistics;

sample mean = 24

standard deviation, σ = 0.4

sample size , n = 49

the confidence interval for a population mean is calculated using the formula;

sample mean ± z-score*(σ/sqrt(n))

the z-score associated with a 95% confidence interval, from the standard normal tables, is;

1.96

substituting these values into the formula;

24 ± 1.96*(0.4/7)

= 24 ± 0.112

from the alternatives given, choice d is closest to the above expression;